Takes a few seconds to find it: https://github.com/thunder-app
But if I understand OPs point correctly Thunder doesn’t seem to do that. As a matter of fact, at least by default, it doesent even compact the same posts.
And yeah, missing out on being able to see comments from multiple threads (hopefully with a noticibly marked community context, so its not lost) is really missing out on the possibilities given by fedi.
Yeah, its getting absurd by now. Maybe we should help with the rebranding a lil bit… In Polish I prefer to call it exTwitter, but in English I’d hope calling it just “formerly” will catch on.